On the first pronunciation of SOUR we get:
Word Pronunciation sour S AW1 ER0 S AW1 R power P AW1 ER0
The phonemes shown in blue satisfy the first requirement of the definition above, while the phonemes shown in red satisfy the second requirement. Therefore this pronunciation of SOUR forms a perfect rhyme with POWER. On the second pronunciation of SOUR we get:
S AW1 ER0
P AW1 ER0
In this case, although the primary stress phonemes of the two pronunciations match, there is a mismatch on the last phoneme of each of the pronunciations. As a result, the first requirement in the definition above is not satisfied. Thus, this pronunciation of SOUR does not rhyme with POWER.
S AW1 R
P AW1 ER0
When we match these pronunciations against each other, we get:
Word Pronunciation prize P R AY1 Z computerize K AH0 M P Y UW1 T ER0 AY2 Z
In other words, the primary stress phoneme in these two words do not match. This violates the first requirement of the definition above, so these two words to not form a perfect rhyme.
P R AY1 Z K AH0 M P Y UW1 T ER0 AY2 Z
When we match these pronunciations against each other, we get:
Word Pronunciation make M EY1 K ache EY1 K
Requirement 1 of the definition is satisfied because the primary stress positions and everything after it are the same in both words. Requirement 2 of the definition is satisfied because the two words do not have the same phoneme before the primary stress phoneme. Therefore these two words form a perfect rhyme.
M EY1 K EY1 K
When we match these pronunciations against each other, we get:
Word Pronunciation brain B R EY1 N drain D R EY1 N
Both words have the same phoneme (shown above in blue) before the primary-stress phoneme, This violates the second requirement of the definition given above. So these two words do not form a perfect rhyme.
Word Pronunciation brain B R EY1 N drain D R EY1 N